论文部分内容阅读
巷道围岩松动圈的测定,对确定井巷的支护参数具有十分重要的意义。巷道围岩松动圈的测定方法很多,其中以声波探测最为迅速简便。目前国内钻孔声波探测时,常向钻孔注水充作耦合剂,这种耦合方式缺点较多,难以在软岩巷道中使用。本文向读者介绍应用干孔探头(换能器)测试围岩松动圈的初步研究结果。一、声波探测围岩松动圈的基本原理声波的波速随介质裂隙发育、密度降
Determination of roadway surrounding rock loose ring, to determine the supporting parameters of the roadway is of great significance. Lane rock surrounding rock determination of many ways, of which the most rapid and easy sound waves detection. At present, when domestic borehole sound waves are detected, the borehole water fill is often used as a coupling agent, which has many disadvantages and is difficult to be used in soft rock tunnels. This article introduces the reader to a preliminary study of the application of a dry hole probe (transducer) to test the loose ring of surrounding rock. First, the basic principles of acoustic detection of loose rock surrounding rock Sonic wave velocity with the development of media fissures, density drop